staging: rtl8723bs: rtw_pwrctrl: Change true/false checks

Change comparisons to true to the variable itself.
Change comparisons to false to the negation of the variable.
Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
Link: https://lore.kernel.org/r/20190725052645.2372-1-nishkadg.linux@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>